例11y= EInsin x,求 Wrr dr(Insinxy'=I (sin x) cOsx=cotx SInx sIn x
结束 解 解 (sin ) sin1 =(ln sin ) = x x x dx dy x x x cos cot sin1 解 = = (sin ) sin1 =(ln sin ) = x x x dx dy x x x cos cot sin1 解 = = (sin ) sin1 =(ln sin )= x x x dx dy x x x cos cot sin1 = = 例 11 y =lnsin x 求dx dy